I agree, but a man will benefit from those activities even more if his T starts out being near, or perhaps even slighly above, normal levels, with "normal" being defined not as the average today, which we know is much lower than in the past for various reasons, but the average from 30 years ago. I am not sure this is a bad thing as long as there is competent medical supervision. It's not for everyone; as others have pointed out, it can worsen heart problems, hypertension, aggression, etc. especially if done to excess. But many Americans are low due to medications, chemicals, age, etc., in addition to still-as-yet-unproven reasons. Proper diet, exercise, *and* supplementation may turn out to be the right solution for many people.